<p>16,378 scored 2250 or above according to college board <a href=“http://media.collegeboard.com/digitalServices/pdf/research/SAT-Percentile-Ranks-Composite-CR-M-W-2013.pdf”>http://media.collegeboard.com/digitalServices/pdf/research/SAT-Percentile-Ranks-Composite-CR-M-W-2013.pdf</a>
Based on some of the other numbers we’ve seen, it seems unlikely that 10-15% of these are AA. But madaboutx is correct. Whatever the exact numbers are, they are very small. To the OP, prepare well for the SAT and or ACT and try to get the highest score possible. There is a lot of demand for high scoring URMs. </p>